It might be difficult to find a sweeter job in Washington than the one Jeffrey Farrow has. As executive director of the Commission for the Preservation of America’s Heritage Abroad, which preserves and protects foreign monuments and buildings, Farrow works only four hours a week but collects an annual salary of $143,000.

With all that free time, Farrow has also been able to hold a side job—as lobbyist for Puerto Rico and the island nation of Palau, which earned him $820,000 last year.

The GSA IG also found the commission agreed to pay Farrow $104,000 per year to work eight hours per week. “Instead, he took the higher salary and worked less than the scheduled amount,” Eric Katz reported at Government Executive. His $143,000 government salary represented nearly 25% of the commission’s annual budget.

Now, Senator Ron Johnson (R-Wisconsin) is looking into Farrow’s arrangement at the commission. Johnson, chairman of the Homeland Security and Governmental Affairs Committee, says he’s unsure if Farrow “shares any personal involvement in the important mission of the commission.”

“Instead,” Johnson continued, “his taxpayer-funded job at the commission seems to have been merely one more source of income for him.”

Johnson sent the commissioners a letter (pdf) outlining his concerns, including whether Farrow, who was formerly a Clinton administration official, has been running his lobbying business out of his government office using taxpayer-funded supplies and equipment.